A species is Extinct when there is no reasonable doubt that the last individual has died. A species is presumed extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the species' life history.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.

A species is Extinct in the Wild when it is known only to survive in captivity or as a naturalized population (or populations) well outside the past range. A species is presumed Extinct in the Wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the species' life history.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.

A species is Critically Endangered when the best available evidence indicates that it meets any of the criteria A to E for Critically Endangered (see IUCN Red List Criteria) and it is therefore considered to be facing an extremely high risk of extinction in the wild.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.

A species is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered, and it is therefore considered to be facing a very high risk of extinction in the wild.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.

A species is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable (see IUCN Red List Criteria), and it is therefore considered to be facing a high risk of extinction in the wild.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.

A species is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.

A species is Least Concern when it has been evaluated against the criteria and does not qualify for Critically Endangered, Endangered, Vulnerable or Near Threatened. Widespread and abundant species are included in this category.

BirdLife International is the official Red Listing Authority for birds for the IUCN Red List 2009.